5G Handover BWP Selection for Multi-BWP Target Cells
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Solution Overview
Problem
In new generation wireless communication systems like 5G or NR, the selection of an appropriate Bandwidth Part (BWP) for handover when a terminal switches to a cell with multiple BWPs is not adequately addressed, limiting flexibility and user experience.
Innovation Solution
A handover command is transmitted by the target cell through the source cell, including bandwidth access information to guide the terminal in selecting and accessing the appropriate BWP, enabling a seamless switch to the target cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network side divides bandwidth into multiple BWPs for a terminal, then the network bandwidth utilization is improved, but the complexity of BWP selection during handover increases
Solution Approach 1:
The network side pre-configures multiple BWPs for the terminal before handover occurs. The handover command includes indication information that points to one of these pre-configured BWPs, allowing the terminal to quickly switch without performing complex real-time selection. This resolves the contradiction by preparing BWP options in advance, maintaining high bandwidth utilization while simplifying the actual handover decision process.
Solution Approach 2:
The handover command acts as an intermediary that carries indication information to guide the terminal's BWP selection. Instead of the terminal independently selecting a BWP from multiple options (which would increase complexity), the network side uses the handover command to indirectly indicate the appropriate BWP, thus maintaining adaptability while reducing selection complexity.
2Measurement precision
If the handover command includes detailed BWP configuration information, then the terminal can accurately select the appropriate BWP, but the signaling overhead increases
Solution Approach 1:
The invention extracts only the essential indication information needed for BWP selection from the full BWP configuration and includes it in the handover command. The terminal already has the complete BWP configurations stored from prior setup, so only a reference or indicator is needed during handover. This resolves the contradiction by separating the detailed configuration (kept locally) from the handover signaling (minimal overhead).
Solution Approach 2:
The complete BWP configuration information is provided to the terminal in advance during the BWP setup phase, before handover occurs. During handover, only a compact indication is needed to select among the pre-configured options. This preliminary provision of full configuration information resolves the contradiction by eliminating the need to transmit detailed BWP parameters again during handover.
3Ease of operation
If the terminal switches to a cell with multiple BWPs without proper BWP selection guidance, then handover flexibility is reduced, but the terminal can still complete the handover process
Solution Approach 1:
The handover command serves as an intermediary that carries indication information to guide the terminal's BWP selection. This indication mechanism maintains handover flexibility by allowing the network to specify the appropriate BWP, while the terminal can still complete the handover process using its existing procedures. The indication information acts as a bridge between the network's bandwidth management strategy and the terminal's handover execution.
Solution Approach 2:
Multiple BWPs are pre-configured for the terminal before handover, and the handover command includes indication information to select among them. This preliminary configuration maintains ease of operation (the terminal can complete handover using standard procedures) while preserving adaptability (the network can guide selection of the most appropriate BWP for the target cell conditions).
Data Source
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AI summary
A switch method, a terminal and a network side device. The method comprises: a terminal receiving a switch command sent by a network-side device through a source cell, wherein the switch command comprises access bandwidth information; and the terminal accessing a target cell on a determined partial bandwidth according to the access bandwidth information, so that the terminal switches from the source cell to the network-side target cell. The technical solution solves the problem of selecting a partial bandwidth for access in switching to a cell having multiple partial bandwidths, the flexibility of a terminal switching to a target cell is enhanced, and the user experience is improved.